"I felt my left foot get hit but don't know if I tripped on my own or was hit," Green-Ellis said. "That's something I'll have to watch film on and see how it went."
The Colts got the ball with 1:06 remaining but marched only to their own 46-yard line before punting it away and taking a 14-0 deficit into the locker room.
Cincinnati pressed the issue to start the third quarter, driving 80 yards on nine plays for a 1-yard Green-Ellis touchdown run that was not in question.
"We had some long drives and some big plays, and we kept scoring points which really helped us out," Bengals quarterback Andy Dalton said after completing 24 of 35 passes for 275 yards and three touchdowns. "Being up 14 going into halftime was big, but we needed to keep it going. The offense did a really good job of being balanced. We had some big runs, and we had some big catches that really helped us win the game."
Dalton threw a 29-yard touchdown pass to Marvin Jones on Cincinnati's opening drive and added a 1-yard strike to Jermaine Gresham at the end of the third quarter and a 9-yard toss to A.J. Green at the start of the fourth. The quarterback also scored on an 8-yard run to cap the Bengals' output with 4:03 remaining in the game.
It was the third straight home game with at least 40 points for Cincinnati, and the Bengals improved to 6-0 at Paul Brown Stadium.
It was also the second time in the past three outings that the Colts defense had surrendered at least 40 points.
"It just comes down to all 11 guys being on the same page and doing their job and being consistent," Indianapolis head coach Chuck Pagano said of the defensive breakdowns. "You can credit them. They made some plays. (Giovani) Bernard and Green-Ellis are darn good running backs. They did a nice job."